The following question is taken directly from the 1999,1994,1989,1987 AP Chem Exam

Answer the following questions regarding light and its interactions with molecules

A) The longest wavelength of light with enough energy to break a Cl-CL bond in CL2 gas is nm.

i) Calculate the frequwncy, in s-1, of the light.

ii) Calculate the energy, in J, of a photon of the light.

B) A line in the spectrum of atomic hydrogen is associated with the electronic transition in the H atom from the sixth energy level (n=6) to the second energy level (n=2).

i) Indicate whether the H atom emits energy or whether it absorbs energy during the transition. Justify your answer.

ii) Calculate the wavelength, in nm, of the radiation associated with the spectral line.

iii) Account for the observation that the amount of energy associated with the same electronic transition (n=6 to n=2) in the He* ion is greater than that associated with the corresponding transition in the H atom

Use these answers for questions 2-4.

A) 1s22s22p53s23p5

B) 1s22s22p63s23p6

C) 1s22s22p62d193s23p6

D) 1s22s22p63s23p63d5

E) 1s22s22p63s23p63d34s2

2. An impossible elctron configuration.

3. The ground state configuration for the atoms of a transition element

4. The ground state configuration of a common ion of an alkaline earth element.

Use the folllowing to answer questions 6-9

A) Heisenburg uncertainty principle

B) Pauli exclusion principle

C) Hund's Rule (principle of maxium multiplicity

D) Shielding effect

E) Wave nature of matter

6. Can be used to predict that a gaseous carbon atom in its ground state is paramagnetic

7. Explains the experiment phenomenom of electron diffraction.

8. Indicates that an atomic orbital can hold no more than two electrons

9. Predicts that it is impossible to determine simutaneously the exact postion and the exact velocity of an electron.

10. Two important concepts that realte to the behavior of an electron in atomic systems are the Heisenberg uncertainity principle and the wave-particle duality of matter.

a) State the Heisenberg uncertainty principle as it relates to determining the postion and momentum of an object.

b) What aspect of the Bohr theory of an atom is considered unsatifactory as a result of the Heisenburg uncertainty principle

c) Explain why the uncertainty principle or the wave-nature of particles is not significant when describing the behavior of electrons.